Fluid-pressure-actuated valve.



M. L. HARNED.

FLUID PRESSURE ACTUATED VALVE. APPLICATION FILED MAR. 12. I918.

Patented Jan. 21,1919.

,1 :9 in as as O1? W'iiS'HINGTON, DISTRICT OF COLUMBIA.

FLUID -19)? T 53ULRE-ACTUATED VALVE.

To ail 10720111. may concern.

Be it known that Main; i ilauxnn, a citizen of the United Stains, residing at lvashington, District cl ioianihia. have invented certain new and nscl'ul improve ments in Flnirl-limsszureilcliual'cd Valves; and I do hereby declare the following to he a full, clear, and exact descr ption oi ihe invention, such as will enahlo others skilled in the art to which it appertains to under. and use the same.

My invention relates to lluid pressure actuated valves and '(icnlarly to Real: type wherein the supply and exhaust oi fluid pressure to the main c linder is urnl'i-ollu l by a fluid pressure operated main valve and the actuation of the latter in turn controlled Furthermore, it is my purpose to provide a two head piston "For acliuatmgthe mam ,valve, the heads of said piston ha\'in; different diameters, wlth the one of smaller diameter constantly connected to the exhgust and thereby nccessilatimz the control 0 fewer passages by the auxiliary valve to effect the correct actuation of the main valve.

I will describe my invention as applied to a steam engine although it will be apparent that it is readily adapted for use in connection with any fluid pressure operated on gine and that it is susceptible to changes in forms and proportions without departing from the scope of the invention as set. forth in the appended claims.

Specification of Letters Patent.

lion filed Liar-ch 12, 1918.

Patented Jan. 2t, HMS? Serial No. 221,990. v

Fig. 3, a plan view of the seat upon which the main valve slides; and

Fig. 4. a detail section illustralinp; the structure for. obviating the possibility oi short stroke of the engine piston.

It will he understood that the diagramniatic view shown in Fig. l is oi the do;- veloped type with respect to the steam chest of the engine so as to bring both the main and auxiliary valves into view with the latter above the former. The actual arrange ment of themain and auxiliary valves in respect to the engine piston and cylinder would depend upon the use of and condilions SllIl0l1Il(llll the complete engine in actual operation.

Referringnow to the drawings the on. nine cylinder is indicated at A, the steam chest at l3 and the engine piston at C. This piston C is provided with the usual packing rings 8 and f). The exhaust passage or port of the cylinder A is shown at.t, while the steam inlet 'l'or lhe steam chest is shown at a. The exhaust pas sage L is connected to the interior oi the steam chest B by a passage a, while opposite ends of the cylinder A are connected respectively with the interior of the steam chest by passages c and (I. The ends of the passages 1, (Z and c which open into the steam chest are controlled by a main valve (3 provided with a cavity madapted to connect the passage c with either the passage 0 or (Z according to the position of the valve. This valve 6 is operated by a piston formed of mutually connected heads 2 and I the former having a greater (lian'ieter than the latter. The space between the heads 2 and 3 is constantly in COII'llllllHlCill'lOli with the steam inlet a, while the outer end of the head 3 is constantly in coi'nmunical'ion with the exhaust passage 1?.

To control the movements of the main valve 6 I employ an auxiliary valve 7 monnted in the steam chest B and actuated by a piston having mutually connected heads 4- and 5. The space between the pistons 4 and 5 is maintained constantly in comn'uinication with the steam inlet a hy-a passage 5. Steam is supplied to and exhausted from the outer end of the head 2 through a passage 7'', which, during the exhaust of steam from the outer end of the head 2, is placed conmuinication with the passage g through. a cavity 9 in the valve 7, said. passage 7 can fill

i. 'tlVQlY into the cylmdcr av points aiu zuzcnt tho lowe and nnpcr ends thereo'l' said port being so located as to he in coininunicalion with the live steam end of the cylinder at tho terniirnition .o'l each stroke of the piston 7. These ports i and also open through the seat of the valve 6 and are controlled by tho latter. The valve (3 is ii url'lier provided wilh a cavity a and passages o and 7), said passages opening at one end into tho cavity in. llhis 'avity n and tho passao o and 7) control the passages Z and 7c and also the tripping ports 1". and as will hereinafter appcarx in operation livc steam cnl'z into the spaco between ill 7- l ea thence lhrounh the passa x inder ii forcing; the 1) on {i downward. Tho steam below the i iiston C exhausts through the passage (f cavity in, passage 0 and passage i. is tho piston C reaches the end of its downward stroke tripping poi-i7 is uncovered, admitting pressure stcain which passes through said port, cavity 97, passage l, and caters behind piston head 5 turning; said piston heath valve 4', and piston head l to the right; the outer end of tho piston head heing open to exhaust through the passage Z, passage, 0, cavity m passago c, and passage 5.

il hen the auxiliary valve moves to the right the live steam o 'wratiugr against the outer end of tho piston head 2 exhausts through the passage 7, cavity y, passage 5 and xhaust passage 2'. the piston head 2 larger in diameter than the piston head 3 and shoe the outer end of the piston head 3 is always open to exhaust the unbalanced pressure on the inner end of piston head 2 moves said piston. head main valve 6, and piston head to the right This closes passage, c to pressure steam and opens said passage to exhaust tl'irougli the :avity m, and passages c and 6; thus exhausting pressurc steam in the cylinder A above the piston C. This movement oi tho nain valve 6 also opens passagc (Z to pressure staarn which passes to the under side-o1 the piston and starts thc upward stroke oi said piston.

rs at a, ii-asses (ls 2 and 3 and (7 into line cyl- This movement oi main valve 3, in addition, blanks the valve end of g i ago 21, opens the valve end oi? pasuzgo 1 1: to exhaust passage 92, cav ty m, and passages e and 25 and connects the valve ,s or passagcs y and E l iears the end of its n p-- As the o ton C i ward s tripping" port is opened to pressure in below the piston. and said slearn passes through port j, cavity in passage Z and ent rs behind p on head 4 forc: ing said piston head, auxiliary valve '2, and piston head 5 to tho left; tho outer cud of he piston hcad being open to exhaust :hrough, passage, ll passage cavity 722, and passages c and 2?.

or H

and 2?, thus exhausting tin pressure steam in cylinder A below the piston (l, '1 his inovcment of the main valve 6 also opens passage 0 to pressure steam which passes to the up per side of the piston C and starts the down ward stroke thereof. In addition this inovci'nent oi the main valve 8 blanks the valve end of passage j, opens thev valve end of passage 5 to exhaust througi passage 0, cavity m, and passages a and Z, and connects the valvo ends of passages and Z; by cavity a.

in order to prevent pren'iature actuation of the auxiliary *alvc 7 and resulting short stroke of the piston C l provide the wall of the cylinder A adjacent each end thereof with cavities and s which extend respectively on either side of the tripping ports 2 and By reference to F lg. i it will be ob served that should any pressure steam collect between tho packing" rings 8 and 9 it will be relieved to the exhaust and of the cylinder through the cavity a" before the space, between said rings passes into coni- :niuniealion with the tripping port i. if such structure were rot provider). and HQS- sure steam between the packing rings should pass through the port 2" it would result in preniaturc movement of the auxiliary valve 7 and short stroke of the piston C.

l l hat is claimed is 2 A 1. In a fluid actuated valve mechanisin, the combination of a piston and cylinder, said cylinder having supply, exhaust and tripping ports, a main steam actuated valve for controlling said ports, an auxiliary valve for controlling the actuation of the main valve and moved by live steam pressure received from the cylinder through rcspectivc tripping ports at the end of each stroke of the piston, and means for relieving any pressure 'fiuid collected between the cyl inner and side face of tho piston prior to tho i op MPE-

movement of the zone of such collection into ,communication with the next active tripping 2. In a fluid actuated valve mechanism, the combination of a piston and cylinder, said cylinder having supply, exhaust and tripping ports, a main steam actuated valve for controlling said ports, an auxiliary valve for controlling the actuation of the main valve and moved by live steam pressure received from the cylinder through respective tripping ports atthe end of each stroke of the piston, and means fo' affording communication between the exhaust end of the cylinder and the zone of any collected pressure fiuid between the cylinder and side face of the piston prior to the movement of such zone into communication with the next active tripping port.

3. In a fluid actuated valve mechanism, the combination of a piston and cylinder, said cylinder having supply, exhaust and tripping ports, a main steam actuated valve for controlling said ports, and an auxiliary valve for controlling the actuation of the main valve and moved by live steam pressure received from the cylinder through respective tripping ports at the end of each stroke of the piston, said cylinder further having recesses in its inner wall extending on either side of the tripping ports respectively for establishing communication between the ex haust end of the cylinder and the zone of any collected pressure fluid between the cylinder and side face of the piston prior to the movement of such zone into communication with the next active. tripping port.

4. In a fluid actuated valve mechanism, the combination of a piston having packing rings and a cylinder, said cylinder having supply, exhaust and tripping ports, a main steam actuated valve for controlling said. ports, an auxiliary valve forcontrolling the actuation of the main valve and moved bv live steam pressure received from the cylinder through respective tripping ports at the end of each stroke of the piston, and means for relieving any pressure fluid col lected between the packing rings prior to the movement of the space between said rings into communication with the next active tripping port.

5. In a fluid actuated valve mechanism, the combination of a piston having packing rings and a cylindelysaid cylinder having sup ply, exhaust and tripping ports, a main steam actuated valve for controlling said ports, an

auxiliary. valve for controlling the actuation of the main valvecand moved by live steam pressure received from the cylinder through respective tripping ports at the end of each stroke of the piston, and means for establishing conumu'iication between the exhaust end of the cylinde' and the space between the packing rings prior to the movement of such space into connnuni -ation with the next active tripping port.

6. In a fluid actuated valve mechanism, the combination of a piston having packing rings and a cylinder, said cylinder having supply, exhaust and tripping ports, a main steam actuated valve for controlling said ports, and an auxiliary valve for eoutrollingthe actuation of the main valve and moved by live steam pressure received from the cylinder through respective tripping ports at the end of each stroke of the piston, said cylinder having recesses in its inner wall extending on either side of the tripping ports respec tively to establish conununication between the exhaust end of the cylinder and the space between the packing rings prior to the movement of such space into comnninication with the next active tripping port.

In testimony whereot I alhx my signature, in the presence of two subscribing witnesses.

MARK L. 'I-IARNED; -Witnesses HENRY 'l. BRIGHT, JOHN H. SIGGERS. 

